/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.spring.util;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * {@link Class} Utilities
 *
 * @author <a href="mailto:mercyblitz@gmail.com">Mercy</a>
 * @since 0.1.1
 */
@SuppressWarnings("unchecked")
public class ClassUtils {

    /**
     * The empty array for {@link Class}
     *
     * @since 1.0.6
     */
    public static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];


    public static <T> Class<T> resolveGenericType(Class<?> declaredClass) {
        ParameterizedType parameterizedType = (ParameterizedType) declaredClass.getGenericSuperclass();
        Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
        return (Class<T>) actualTypeArguments[0];
    }
}
